#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>

int main()
{

    printf("begin:我是一个进程，pid:%d,ppid:%d\n",getpid(),getppid());
    sleep(1);
    pid_t id= fork();
    if(id == 0)
    {
        //子进程
        printf("I am child :pid: %d!, ppid: %d\n", getpid(), getppid());
        sleep(1);
    }
    else if(id>0)
    {
        //父进程
        printf("I am parent :pid: %d!, ppid: %d\n", getpid(), getppid());
        sleep(1);
    }
    else{
        //error
    }

    sleep(1);
    return 0;
}
